倒计时脚本

一个简单的倒计时脚本备忘

<!--倒计时开始-->		
			<b><font color=#FF0000>时间倒计时：</font></b><span id="span_dt_dt"></span>
			<font color="#FF0000">
			<SCRIPT language=javascript>
			<!--
			function show_date_time(){
			window.setTimeout("show_date_time()", 1000);
			BirthDay=new Date("10-15-2008 20:10:23");//
			today=new Date();
			timeold=(BirthDay.getTime()-today.getTime());
			sectimeold=timeold/1000
			secondsold=Math.floor(sectimeold);
			msPerDay=24*60*60*1000
			e_daysold=timeold/msPerDay
			daysold=Math.floor(e_daysold);
			e_hrsold=(e_daysold-daysold)*24;
			hrsold=Math.floor(e_hrsold);
			e_minsold=(e_hrsold-hrsold)*60;
			minsold=Math.floor((e_hrsold-hrsold)*60);
			seconds=Math.floor((e_minsold-minsold)*60);
			span_dt_dt.innerHTML="<b><font color=00CC00>"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒"+"</b><br></font>" ;
			}
			show_date_time();
			//-->
			</SCRIPT>
			</font>
<!--倒计时完毕-->